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  1. #1
    Registered User
    Join Date
    Mar 2011
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    2

    Qml Apps in nokia n97(s60v5)

    hey guys i was just wondering that whenever i build my own Qml app and deploy it on my n97 its very sluggish and the transitions stutter if you know what i mean....

    please advise me on what to do i really want to get better at this...
    btw tell me if yours does the same

    thanks i appreciate it a lot (:

  2. #2
    Nokia Developer Moderator
    Join Date
    Jul 2006
    Location
    Tampere, Finland
    Posts
    13

    Re: Qml Apps in nokia n97(s60v5)

    When targeting a device which does not have a GPU (like all 5th edition devices), it is advisable to keep animations to a minimum. In my experience even a very simple application doesn't go above 20-30 fps, and with a more complex application fps can easily drop to below 20 on a 5th edition device, while a Symbian^3 device can maintain around 60 fps when running the same application.

    To make sure that the application works as well as possible, make sure that you don't have too many animations, keep delegates simple and limit the amount of JavaScript. One thing that seems to affect performance quite a lot is to make sure that you have the smooth-property set to false for Images, Text etc. Qt documentation also has some advice on QML performance: http://doc.qt.nokia.com/4.7/qdeclara...rformance.html
    - Late

  3. #3
    Registered User
    Join Date
    Jun 2007
    Location
    Mumbai, India
    Posts
    1,998

    Re: Qml Apps in nokia n97(s60v5)

    Quote Originally Posted by Supernova746 View Post
    hey guys i was just wondering that whenever i build my own Qml app and deploy it on my n97 its very sluggish and the transitions stutter if you know what i mean....

    please advise me on what to do i really want to get better at this...
    btw tell me if yours does the same

    thanks i appreciate it a lot (:
    As mentioned above heavy QML animations work fine only with devices having GPU. Even some animations seems to be sluggish on devices like N900.

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